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A keyboard-focused Mac mail client with OpenPGP and S/MIME

Replace phrases and paragraphs across documents

Self-paced courses with subject and specialization routes.

Math and personal-finance calculation tools

Portable symbolic algebra with numerical approximation

Computer algebra with graphs, geometry and statistics

An enhanced Airsonic-based music-streaming server

Topic-based calculators for practical questions

Formula calculators with selectable input units

Calculators with contextual input help

Construction and everyday calculations with searchable tasks

Scientific and everyday calculations with units

A searchable catalogue of calculations and conversions

Engineering formulas, reference data and calculation tools

Symbolic and numerical mathematics with notebook interfaces

Symbolic expressions with documented algorithms

Symbolic, numerical and graphical mathematics tools

Everyday calculation categories with a simple keypad

Convert TeX-family sources into web and ebook formats

STEM graduate jobs, placements and employer information

Python self-study with advanced and numerical branches

Calculators for work, study and household questions

Symbolic, numerical and number-theory calculators

Independent book and media sellers with edition-search routes